Hello,
Last night I accidentally drained the battery fully ( it gave me 7% low battery sign, but I wasn't able to charge it) so it turned off, and I was too tired to charge it, so the next morning I tried to charge it, it worked, but when I tried to turn it on it won't power on.

One of my friends told me I probably fully drained the laptop's battery, and I should just leave it to charge overnight, which was probably correct because the charging light went from amber red (blinking) to a steady white light ( which in the manual

says the battery power is over 80%, but still when I try to power it on, it still won't work.

i still have its warranty, and I just bought it a little less than over 4 months ago, which is sad, are lenovo laptops this faulty?

Anyways, is there anything I could do for now to speed up the process of it being fully charged?
or maybe this is even a different case, and my laptop broke?

This is usually not a fault as such, but caused by some residual charge being "in the wrong place" to allow boot up. Please forgive the bad (wrong) description, but its the best I can do at 01:50 in the morning.

Try removing the battery completely and removing the charger. Now press and hld the [ON] button for about 30 seconds. Replace the battery and swich it on normally.

So I tried to open it up,since the battery is inside,but unfortunately I couldn't open it since I didn't know how, and there are no tutorials in youtube for my laptop on how to get the battery out. is there any other way?

and opening it up and removing the battery. wouldn't that make the warranty void?

Yes - I didnt realise you had to unscrew things on this model. I would recommend against removing the back, and if needed take it back to the shop.

However, there is also an "Advanced" sleep mode that your machine may have gone into. According to the manual for this machine you could try holding the power button for about 5 seconds and then if it doesnt come on try the power button as normal.

Thank you so much for the fast reply, ill be trying that in a bit, since my laptop's battery is inside itself and I still have to screw it open just to get it.

I'll have to find myself a small screw driver, then ill update you on what I get. Thanks so much for the fast reply mate, i've been up all night trying to figure this out, I hope it works, if so, you just saved me 1000$.